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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a JupyterLab extension that provides LiteLLM model abstraction for Jupyter AI. It exposes LiteLLM's extensive catalog of language models (OpenAI, Anthropic, Google, Cohere, Azure, AWS, etc.) through a standardized REST API.
+
+## Development Commands
+
+### Setup and Installation
+```bash
+# Development install
+pip install -e ".[test]"
+jupyter server extension enable jupyter_ai_litellm
+
+# Development uninstall
+jupyter server extension disable jupyter_ai_litellm
+pip uninstall jupyter_ai_litellm
+```
+
+### Testing
+```bash
+# Install test dependencies
+pip install -e ".[test]"
+
+# Run all tests with coverage
+pytest -vv -r ap --cov jupyter_ai_litellm
+
+# Run specific test file
+pytest jupyter_ai_litellm/tests/test_handlers.py -v
+```
+
+### Package Building
+```bash
+# Build package (uses hatchling)
+python -m build
+
+# Version management
+hatch version
+```
+
+## Architecture
+
+### Core Components
+
+- **`jupyter_ai_litellm/__init__.py`**: Extension entry point and Jupyter server integration
+- **`jupyter_ai_litellm/handlers.py`**: Request routing and handler setup
+- **`jupyter_ai_litellm/chat_models_rest_api.py`**: REST API handler for chat models endpoint
+- **`jupyter_ai_litellm/model_list.py`**: LiteLLM model discovery and categorization
+
+### API Endpoints
+
+The extension provides REST endpoints under `/api/ai/`:
+- `GET /api/ai/models/chat` - Returns list of available chat models in LiteLLM format
+
+### Model Discovery
+
+Models are automatically discovered from LiteLLM's `models_by_provider` and categorized into:
+- Chat models (stored in `CHAT_MODELS`)
+- Embedding models (stored in `EMBEDDING_MODELS`)
+
+Model IDs follow LiteLLM format: `provider/model-name` (e.g., `openai/gpt-4`, `anthropic/claude-3-sonnet`)
+
+### Jupyter Server Integration
+
+The extension registers as a Jupyter server extension through:
+- `_jupyter_server_extension_points()` - Declares extension module
+- `_load_jupyter_server_extension()` - Sets up handlers and logging
+- Server configuration in `jupyter-config/server-config/jupyter_ai_litellm.json`
+
+### Testing Framework
+
+Uses pytest with:
+- `pytest-jupyter` for Jupyter server testing
+- `jp_fetch` fixture for API endpoint testing
+- Configuration via `conftest.py`
+
+## Key Dependencies
+
+- `jupyter_server>=2.4.0,<3` - Jupyter server framework
+- `litellm>=1.73,<2` - Model abstraction library
+- `tornado` - Web framework (via jupyter_server)
+- `pydantic` - Data validation for API responses